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[Starpu-devel] huge regression in LWS scheduler


Chronologique Discussions 
  • From: Alfredo Buttari <alfredo.buttari@enseeiht.fr>
  • To: starpu-devel@lists.gforge.inria.fr, Emmanuel Agullo <Emmanuel.Agullo@inria.fr>, Abdou Guermouche <abdou.guermouche@labri.fr>
  • Subject: [Starpu-devel] huge regression in LWS scheduler
  • Date: Wed, 8 Jun 2016 15:20:01 +0200
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Dear all,
I am making a few tests with qr_mumps on an Intel KNL machine with 64 cores and I am getting very weird performance with the latest trunk version when the LWS scheduler is chosen. Here are the results I am getting (exactly the same problem for every test, always using 64 cores):

starpu-1.2.0rc5 eager : 513 Gflop/s
starpu-1.2.0rc5 lws   : 623 Gflop/s

starpu r17762 eager   : 625 Gflop/s
starpu r17762 lws     : 116 Gflop/s

I don't have exclusive access to the machine and it's not easy to run many tests but I can do a few more if you want.

Ciao,
Alfredo


--
-----------------------------------------
Alfredo Buttari, PhD
CNRS-IRIT
2 rue Camichel, 31071 Toulouse, France
http://buttari.perso.enseeiht.fr



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